Ruben wants to plant a rectangular vegetable garden. He will use a patch of land that is 3 times as long as it is wide. Ruben also decides to leave a 3-inch border along the perimeter of the garden, where nothing will be planted. This leaves Ruben with a total planting area of 180 square inches.

Which equation correctly describes the available planting area for the vegetable garden?

Answers:

180=3x^2-12x+9

180=3x^2-24x+36

180=4x-3

180=3x^2+12x-6